EP3230281B1 - 1,3-thiazol-2-yl substituted benzamides - Google Patents

1,3-thiazol-2-yl substituted benzamides Download PDF

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Publication number
EP3230281B1
EP3230281B1 EP15804824.9A EP15804824A EP3230281B1 EP 3230281 B1 EP3230281 B1 EP 3230281B1 EP 15804824 A EP15804824 A EP 15804824A EP 3230281 B1 EP3230281 B1 EP 3230281B1
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Prior art keywords
methyl
thiazol
ethyl
benzamide
mmol
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German (de)
English (en)
French (fr)
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EP3230281A1 (en
Inventor
Adam James Davenport
Nico Braeuer
Oliver Martin Fischer
Andrea Rotgeri
Antje Rottmann
Ioana NEAGOE
Jens Nagel
Anne-Marie GODINHO-COELHO
Juergen Klar
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Bayer AG
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Bayer AG
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Priority to EP19181710.5A priority Critical patent/EP3587417B9/en
Priority to RS20211014A priority patent/RS62227B1/sr
Priority to SI201531643T priority patent/SI3230281T1/sl
Priority to PL15804824T priority patent/PL3230281T3/pl
Application filed by Bayer AG filed Critical Bayer AG
Priority to PL19181710T priority patent/PL3587417T3/pl
Priority to DK19181710.5T priority patent/DK3587417T3/da
Publication of EP3230281A1 publication Critical patent/EP3230281A1/en
Publication of EP3230281B1 publication Critical patent/EP3230281B1/en
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Priority to HRP20211002TT priority patent/HRP20211002T1/hr
Priority to CY20221100217T priority patent/CY1125083T1/el
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/535—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with at least one nitrogen and one oxygen as the ring hetero atoms, e.g. 1,2-oxazines
    • A61K31/5375—1,4-Oxazines, e.g. morpholine
    • A61K31/5377—1,4-Oxazines, e.g. morpholine not condensed and containing further heterocyclic rings, e.g. timolol
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D417/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00
    • C07D417/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings
    • C07D417/12—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings linked by a chain containing hetero atoms as chain links
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/41—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with two or more ring hetero atoms, at least one of which being nitrogen, e.g. tetrazole
    • A61K31/433—Thidiazoles
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/435—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with one nitrogen as the only ring hetero atom
    • A61K31/44—Non condensed pyridines; Hydrogenated derivatives thereof
    • A61K31/4427—Non condensed pyridines; Hydrogenated derivatives thereof containing further heterocyclic ring systems
    • A61K31/4439—Non condensed pyridines; Hydrogenated derivatives thereof containing further heterocyclic ring systems containing a five-membered ring with nitrogen as a ring hetero atom, e.g. omeprazole
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
    • A61K31/4965—Non-condensed pyrazines
    • A61K31/497—Non-condensed pyrazines containing further heterocyclic rings
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
    • A61K31/50—Pyridazines; Hydrogenated pyridazines
    • A61K31/501—Pyridazines; Hydrogenated pyridazines not condensed and containing further heterocyclic rings
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
    • A61K31/505—Pyrimidines; Hydrogenated pyrimidines, e.g. trimethoprim
    • A61K31/506—Pyrimidines; Hydrogenated pyrimidines, e.g. trimethoprim not condensed and containing further heterocyclic rings
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P13/00—Drugs for disorders of the urinary system
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P13/00—Drugs for disorders of the urinary system
    • A61P13/10—Drugs for disorders of the urinary system of the bladder
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P25/00—Drugs for disorders of the nervous system
    • A61P25/14—Drugs for disorders of the nervous system for treating abnormal movements, e.g. chorea, dyskinesia
    • A61P25/16—Anti-Parkinson drugs
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    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
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    • A61P25/28—Drugs for disorders of the nervous system for treating neurodegenerative disorders of the central nervous system, e.g. nootropic agents, cognition enhancers, drugs for treating Alzheimer's disease or other forms of dementia
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    • A61P29/00—Non-central analgesic, antipyretic or antiinflammatory agents, e.g. antirheumatic agents; Non-steroidal antiinflammatory drugs [NSAID]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/12—Antivirals
    • A61P31/14—Antivirals for RNA viruses
    • A61P31/18—Antivirals for RNA viruses for HIV
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D417/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00
    • C07D417/14—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing three or more hetero rings
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D471/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00
    • C07D471/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00 in which the condensed system contains two hetero rings
    • C07D471/08—Bridged systems
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D498/00—Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and oxygen atoms as the only ring hetero atoms
    • C07D498/02—Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and oxygen atoms as the only ring hetero atoms in which the condensed system contains two hetero rings
    • C07D498/08—Bridged systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Definitions

  • the present invention relates to 1,3-thiazol-2-yl substituted benzamide compounds of general formula (I) as described and defined herein, to pharmaceutical compositions and combinations comprising said compounds and to the use of said compounds for manufacturing a pharmaceutical composition for the treatment or prophylaxis of a disease, in particular of neurogenic disorder, as a sole agent or in combination with other active ingredients.
  • P2X purinoceptor 3 is a protein that in humans is encoded by the P2RX3 gene ( Garcia-Guzman M, Stuhmer W, Soto F (Sep 1997). "Molecular characterization and pharmacological properties of the human P2X3 purinoceptor". Brain Res Mol Brain Res 47 (1-2): 59-66 ). The product of this gene belongs to the family of purinoceptors for ATP. This receptor functions as a ligand-gated ion channel and transduces ATP-evoked nociceptor activation.
  • P2X purinoreceptors are a family of ligand-gated ion channels that are activated by ATP. To date, seven members of this family have been cloned, comprising P2X1-7 [ Burnstock 2013, front Cell Neurosci 7:227 ]. These channels can exist as homomers and heteromers [ Saul 2013, front Cell Neurosci 7:250 ]. Purines, such as ATP, have been recognized as important neurotransmitters and by acting via their respective receptors they have been implicated in various physiological and pathophysiological roles [ Burnstock 1993, Drug Dev Res 28:196-206 ; Burnstock 2011, Prog Neurobiol 95:229-274 ; Jiang 2012, Cell Health Cytoskeleton 4:83-101 ].
  • the P2X3 receptor has been recognized as an important mediator of nociception [ Burnstock 2013, Eur J Pharmacol 716:24-40 ; North 2003, J Phyiol 554:301-308 ; Chizh 2000, Pharmacol Rev 53:553-568 ]. It is mainly expressed in dorsal root ganglia in a subset of nociceptive sensory neurons. During inflammation the expression of the P2X3 receptor is increased, and activation of P2X3 receptor has been described to sensitize peripheral nerves [ Fabretti 2013, front Cell Neurosci 7:236 ].
  • P2X3 receptor knock-out mice show a reduced pain response [ Cockayne 2000, Nature 407:1011-1015 ; Souslova 2000, Nature 407:1015-1017 ].
  • P2X3 receptor antagonists have been shown to act anti-nociceptive in different models of pain and inflammatory pain [ Ford 2012, Purin Signal 8 (Suppl 1):S3-S26 ].
  • the P2X3 receptor has also been shown to integrate different nociceptive stimuli.
  • Hyperalgesia induced by PGE2, ET-1 and dopamine have all been shown to be mediated via release of ATP and activation of the P2X3 receptor [ Prado 2013, Neuropharm 67:252-258 ; Joseph 2013, Neurosci 232C: 83-89 ].
  • the P2X3 receptor has been shown to be involved in genitourinary, gastrointestinal and respiratory conditions and disorders, including overactive bladder and chronic cough [ Ford 2013, front Cell Neurosci 7:267 ; Burnstock 2014, Purin Signal 10(1):3-50 ].
  • ATP-release occurs in these 2 examples from epithelial cells, which in turn activates the P2X3 receptor and induces contraction of bladder and lung muscles respectively leading to premature voiding or cough.
  • P2X3 subunits do not only form homotrimers but also heterotrimers with P2X2 subunits. P2X3 subunits and P2X2 subunits are also expressed on nerve fibres innervating the tongue, therein taste buds [ Kinnamon 2013, front Cell Neurosci 7:264 ]. In a phyiosological setting, receptors containing P2X3 and/ or P2X2 subunits are involved in the transmission of taste from the tongue (bitter, sweet, salty, umami and sour).
  • P2X3 and P2X2/3 nonselective receptor antagonists Compounds blocking both the exclusively P2X3 subunit containing ion channel (P2X3 homomer) as well as the ion channel composed of P2X2 and P2X3 subunit (P2X2/3 heterotrimer) are called P2X3 and P2X2/3 nonselective receptor antagonists [Ford, Pain Manag 2012].
  • P2X2 and P2X3 subunits are expressed on sensory nerve fibers innervating the tongue. Knock-out animals deficient for P2X2 and P2X3 subunits show reduced taste sensation and even taste loss [ Finger et al, Science 2005 ], whereas P2X3 subunit single knock-outs exhibit a mild or no change in phenotype with respect to taste. Moreover, 2 distinct populations of neurons have been described in the geniculate ganglion expressing either P2X2 and P2X3 subunits or P2X3 subunit alone.
  • P2X3-homomeric receptor-selective antagonists are deemed to be superior towards non-selective receptor antagonists and are considered to represent a solution towards the problem of insufficient patient compliance during chronic treatment as indicated by increased drop-out rates during Phil trials [ Strand et al, 2015 ACR/ARMP Annual Meeting, Abstract 2240 and A. Ford, London 2015 Pain Therapeutics Conference, congress report ].
  • said compounds of the present invention have surprisingly been found to effectively inhibit the P2X3 receptor and may therefore be used for the treatment or prophylaxis of following diseases:
  • the compounds of the present invention show high P2X3 receptor inhibition and furthermore selectivity over the P2X2/3 receptor.
  • Selective inhibition of the P2X3 receptor over the P2X2/3 receptor means at least 3-fold selectivity over the P2X2/3 receptor.
  • Preferred compounds of the present invention show at least 10-fold selectivity over the P2X2/3 receptor.
  • more preferred compounds of the present invention show further advantageous properties that are beneficial for their use as medicaments, such as desirable pharmacokinetic profiles that provide suitable metabolic stability and oral bioavailability.
  • compositions of the present invention show further advantageous properties that are beneficial for their use as medicaments, such as desirable pharmacokinetic profiles that provide suitable metabolic stability and oral bioavailability, and at least one additional advantageous property chosen from an advantageous cardiovascular profile and a suitable CYP inhibition profile.
  • the present invention covers compounds of general formula (I): in which
  • the present invention further relates to compounds of general formula (Ia),
  • the present invention further relates to pharmaceutical compositions and combinations comprising said compounds, to use of said compounds for manufacturing a medicament for the treatment or prophylaxis of diseases or disorders and for the treatment of pains which are associated with such diseases.
  • alkyl is to be understood as meaning a linear or branched, saturated, monovalent hydrocarbon group with the number of carbon atoms as specified and having as a rule, 1 to 4 for all other alkyl substituents, preferably 1 to 3, carbon atoms, by way of example and by preference a methyl, ethyl, propyl, butyl, iso -propyl, iso -butyl, sec -butyl, tert-butyl, group, or an isomer thereof.
  • said group has 1, 2, 3 or 4 carbon atoms ("C 1 -C 4 -alkyl”), e.g.
  • C 1 -C 3 -alkyl a methyl, ethyl, n-propyl- or iso-propyl group, and even more particularly 1 or 2 carbon atoms
  • C 1 -C 2 -alkyl e.g. a methyl or ethyl group.
  • R 2 in formula (I) or (Ia) can be in a more preferred embodiment (3R)-tetrahydrofuran-3-yl, or (3S)-tetrahydrofuran-3-yl.
  • C 1 -C 4 as used throughout this text is to be understood as meaning a group having a finite number of carbon atoms of 1 to 4, i.e. 1, 2, 3 or 4 carbon atoms, e.g. in the context of the definition of "C 1 -C 4 -alkyl", it is to be understood as meaning an alkyl group having a finite number of carbon atoms of 1 to 4, i.e. 1, 2, 3 or 4 carbon atoms.
  • C 1 -C 3 as used in the context of the definition "C 1 -C 3 -alkoxy” is to be understood as meaning an alkoxy group, having a finite number of carbon atoms of 1 to 3, i.e.
  • substituted means that one or more hydrogens on the designated atom is replaced with a selection from the indicated group, provided that the designated atom's normal valency under the existing circumstances is not exceeded, and that the substitution results in a stable compound. Combinations of substituents and/or variables are permissible only if such combinations result in stable compounds.
  • optionally substituted means that the number of substituents can be zero. Unless otherwise indicated, optionally substituted groups may be substituted with as many optional substituents as can be accommodated by replacing a hydrogen atom with a non-hydrogen substituent on any available carbon or nitrogen atom. Commonly, the number of optional substituents (when present) ranges from 1 to 5, in particular from 1 to 3.
  • the term "one or more”, e.g. in the definition of the substituents of the compounds of the general formulae of the present invention, is understood as meaning “one, two, three, four or five, particularly one, two, three or four, more particularly one, two or three, even more particularly one or two".
  • the invention also includes all suitable isotopic variations of a compound of the invention.
  • An isotopic variation of a compound of the invention is defined as one in which at least one atom is replaced by an atom having the same atomic number but an atomic mass different from the atomic mass usually or predominantly found in nature.
  • isotopes that can be incorporated into a compound of the invention include isotopes of hydrogen, carbon, nitrogen, oxygen, sulphur, fluorine and chlorine such as 2 H (deuterium), 3 H (tritium), 11 C, 13 C, 14 C, 15 N, 17 O, 18 O, 33 S, 34 S, 35 S, 36 S, 18 F and 36 Cl, , respectively.
  • isotopic variations of a compound of the invention are useful in drug and/or substrate tissue distribution studies. Tritiated and carbon-14, i.e., 14 C, isotopes are particularly preferred for their ease of preparation and detectability. Further, substitution with isotopes such as deuterium may afford certain therapeutic advantages resulting from greater metabolic stability, for example, increased in vivo half-life or reduced dosage requirements and hence may be preferred in some circumstances.
  • isotopic variations of a compound of the invention can generally be prepared by conventional procedures known by a person skilled in the art such as by the illustrative methods or by the preparations described in the examples hereafter using appropriate isotopic variations of suitable reagents.
  • Optical isomers can be obtained by resolution of the racemic mixtures according to conventional processes, for example, by the formation of diastereoisomeric salts using an optically active acid or base or formation of covalent diastereomers.
  • appropriate acids are tartaric, diacetyltartaric, ditoluoyltartaric and camphorsulfonic acid.
  • Mixtures of diastereoisomers can be separated into their individual diastereomers on the basis of their physical and/or chemical differences by methods known in the art, for example, by chromatography or fractional crystallisation.
  • the optically active bases or acids are then liberated from the separated diastereomeric salts.
  • a different process for separation of optical isomers involves the use of chiral chromatography (e.g., chiral HPLC columns), with or without conventional derivatisation, optimally chosen to maximise the separation of the enantiomers.
  • Suitable chiral HPLC columns are manufactured by Daicel, e.g., Chiracel OD and Chiracel OJ among many others, all routinely selectable.
  • Enzymatic separations, with or without derivatisation are also useful.
  • the optically active compounds of this invention can likewise be obtained by chiral syntheses utilizing optically active starting materials.
  • the compounds of the present invention may exist as tautomers.
  • the present invention includes all possible tautomers of the compounds of the present invention as single tautomers, or as any mixture of said tautomers, in any ratio.
  • the present invention also relates to useful forms of the compounds as disclosed herein, such as hydrates, solvates, salts, in particular pharmaceutically acceptable salts, and co-precipitates.
  • stable compound' or “stable structure” is meant a compound that is sufficiently robust to survive isolation to a useful degree of purity from a reaction mixture, and formulation into an efficacious therapeutic agent.
  • the compounds of the present invention can exist as a hydrate, or as a solvate, wherein the compounds of the present invention contain polar solvents, in particular water, methanol or ethanol for example as structural element of the crystal lattice of the compounds.
  • polar solvents in particular water, methanol or ethanol for example as structural element of the crystal lattice of the compounds.
  • the amount of polar solvents, in particular water may exist in a stoichiometric or non-stoichiometric ratio.
  • stoichiometric solvates e.g. a hydrate, hemi-, (semi-), mono-, sesqui-, di-, tri-, tetra-, penta- etc. solvates or hydrates, respectively, are possible.
  • the present invention includes all such hydrates or solvates.
  • the compounds of the present invention can exist in free form, e.g. as a free base, or as a free acid, or as a zwitterion, or can exist in the form of a salt.
  • Said salt may be any salt, either an organic or inorganic addition salt, particularly any pharmaceutically acceptable organic or inorganic addition salt, customarily used in pharmacy.
  • pharmaceutically acceptable salt refers to a relatively non-toxic, inorganic or organic acid addition salt of a compound of the present invention.
  • pharmaceutically acceptable salt refers to a relatively non-toxic, inorganic or organic acid addition salt of a compound of the present invention.
  • S. M. Berge, et al. “Pharmaceutical Salts,” J. Pharm. Sci. 1977, 66, 1-19 .
  • a suitable pharmaceutically acceptable salt of the compounds of the present invention may be, for example, an acid-addition salt of a compound of the present invention bearing a nitrogen atom, in a chain or in a ring, for example, which is sufficiently basic, such as an acid-addition salt with an inorganic acid, such as hydrochloric, hydrobromic, hydroiodic, sulfuric, bisulfuric, phosphoric, or nitric acid, for example, or with an organic acid, such as formic, acetic, acetoacetic, pyruvic, trifluoroacetic, propionic, butyric, hexanoic, heptanoic, undecanoic, lauric, benzoic, salicylic, 2-(4-hydroxybenzoyl)-benzoic, camphoric, cinnamic, cyclopentanepropionic, digluconic, 3-hydroxy-2-naphthoic, nicotinic, pamoic, pectinic
  • an alkali metal salt for example a sodium or potassium salt
  • an alkaline earth metal salt for example a calcium or magnesium salt
  • an ammonium salt or a salt with an organic base which affords a physiologically acceptable cation, for example a salt with N-methyl-glucamine, dimethyl-glucamine, ethyl-glucamine, lysine, dicyclohexylamine, 1,6-hexadiamine, ethanolamine, glucosamine, sarcosine, serinol, tris-hydroxy-methyl-aminomethane, aminopropandiol, sovak-base, 1-amino-2,3,4-butantriol.
  • basic nitrogen containing groups may be quaternised with such agents as lower alkyl halides such as methyl, ethyl, propyl, and butyl chlorides, bromides and iodides ; dialkyl sulfates like dimethyl, diethyl, and dibutyl sulfate ; and diamyl sulfates, long chain halides such as decyl, lauryl, myristyl and stearyl chlorides, bromides and iodides, aralkyl halides like benzyl and phenethyl bromides and others.
  • lower alkyl halides such as methyl, ethyl, propyl, and butyl chlorides, bromides and iodides
  • dialkyl sulfates like dimethyl, diethyl, and dibutyl sulfate
  • diamyl sulfates long chain halides such as decyl, lau
  • acid addition salts of the claimed compounds may be prepared by reaction of the compounds with the appropriate inorganic or organic acid via any of a number of known methods.
  • alkali and alkaline earth metal salts of acidic compounds of the invention are prepared by reacting the compounds of the invention with the appropriate base via a variety of known methods.
  • the present invention includes all possible salts of the compounds of the present invention as single salts, or as any mixture of said salts, in any ratio.
  • the compounds of the present invention are also referred to isomers, enantiomers, diastereomers, racemates, hydrates, solvates, or a salt thereof, or a mixture of same.
  • in vivo hydrolysable ester is understood as meaning an in vivo hydrolysable ester of a compound of the present invention containing a carboxy or hydroxy group, for example, a pharmaceutically acceptable ester which is hydrolysed in the human or animal body to produce the parent acid or alcohol.
  • esters for carboxy include for example alkyl, cycloalkyl and optionally substituted phenylalkyl, in particular benzyl esters, C 1 -C 6 alkoxymethyl esters, e.g. methoxymethyl, C 1 -C 6 alkanoyloxymethyl esters, e.g. pivaloyloxymethyl, phthalidyl esters, C 3 -C 8 cycloalkoxy-carbonyloxy-C 1 -C 6 alkyl esters, e.g. 1-cyclohexylcarbonyloxyethyl; 1,3-dioxolen-2-onylmethyl esters, e.g.
  • An in vivo hydrolysable ester of a compound of the present invention containing a hydroxy group includes inorganic esters such as phosphate esters and [alpha]-acyloxyalkyl ethers and related compounds which as a result of the in vivo hydrolysis of the ester breakdown to give the parent hydroxy group.
  • [alpha]-acyloxyalkyl ethers include acetoxymethoxy and 2,2-dimethylpropionyloxymethoxy.
  • a selection of in vivo hydrolysable ester forming groups for hydroxy include alkanoyl, benzoyl, phenylacetyl and substituted benzoyl and phenylacetyl, alkoxycarbonyl (to give alkyl carbonate esters), dialkylcarbamoyl and N-(dialkylaminoethyl)-N-alkylcarbamoyl (to give carbamates), dialkylaminoacetyl and carboxyacetyl.
  • the present invention covers all such esters.
  • the present invention includes all possible crystalline forms, or polymorphs, of the compounds of the present invention, either as single polymorphs, or as a mixture of more than one polymorph, in any ratio.
  • the present invention covers compounds of general formula (Ia):
  • R 1 represents C 1 -C 4 -alkyl, preferably methyl or ethyl; and in which A, R 2 and R 3 have the same meaning as defined in general formula (I), or an enantiomer, diastereomer, racemate, hydrate, solvate, or a salt thereof, or a mixture of same.
  • R 1 represents C 1 -C 4 -alkyl, preferably methyl or ethyl; and in which A, R 2 and R 3 have the same meaning as defined in general formula (Ia), or an enantiomer, diastereomer, racemate, hydrate, solvate, or a salt thereof, or a mixture of same.
  • the invention relates to compounds of general formula (I), wherein A represents CF 3 -pyrimidinyl, preferably 2-CF 3 -pyrimidin-5-yl; and in which R 1 , R 2 and R 3 have the same meaning as defined in general formula (I), or an enantiomer, diastereomer, racemate, hydrate, solvate, or a salt thereof, or a mixture of same.
  • the invention relates to compounds of general formula (Ia), wherein A represents CF 3 -pyrimidinyl, preferably 2-CF 3 -pyrimidin-5-yl; and in which R 1 , R 2 and R 3 have the same meaning as defined in general formula (Ia), or an enantiomer, diastereomer, racemate, hydrate, solvate, or a salt thereof, or a mixture of same.
  • the invention relates to compounds of general formula (I), wherein R 2 represents unsubstituted tetrahydrofuran-3-yl; and in which R 1 , A and R 3 have the same meaning as defined in general formula (I), or an enantiomer, diastereomer, racemate, hydrate, solvate, or a salt thereof, or a mixture of same.
  • the invention relates to compounds of general formula (Ia), wherein R 2 represents unsubstituted tetrahydrofuran-3-yl; and in which R 1 , A and R 3 have the same meaning as defined in general formula (Ia), or an enantiomer, diastereomer, racemate, hydrate, solvate, or a salt thereof, or a mixture of same.
  • the invention relates to compounds of formula (I), wherein R 2 represents unsubstituted (3R)-tetrahydrofuran-3-yl, or (3S)-tetrahydrofuran-3-yl; and in which R 1 , A and R 3 have the same meaning as defined in general formula (I), or an enantiomer, diastereomer, racemate, hydrate, solvate, or a salt thereof, or a mixture of same.
  • the invention relates to compounds of formula (I), wherein R 2 represents unsubstituted (3R)-tetrahydrofuran-3-yl; and in which R 1 , A and R 3 have the same meaning as defined in general formula (I), or an enantiomer, diastereomer, racemate, hydrate, solvate, or a salt thereof, or a mixture of same.
  • the invention relates to compounds of formula (Ia), wherein R 2 represents unsubstituted (3R)-tetrahydrofuran-3-yl, or (3S)-tetrahydrofuran-3-yl; and in which R 1 , A and R 3 have the same meaning as defined in general formula (Ia), or an enantiomer, diastereomer, racemate, hydrate, solvate, or a salt thereof, or a mixture of same.
  • the invention relates to compounds of formula (Ia), wherein R 2 represents unsubstituted (3R)-tetrahydrofuran-3-yl; and in which R 1 , A and R 3 have the same meaning as defined in general formula (Ia), or an enantiomer, diastereomer, racemate, hydrate, solvate, or a salt thereof, or a mixture of same.
  • Preferred compounds are, namely
  • An even more preferred compound is 3-(5-methyl-1,3-thiazol-2-yl)-5-[(3R)-tetrahydrofuran-3-yloxy]-N-[(1R)-1-[2-(trifluoromethyl)pyrimidin-5-yl]ethyl ⁇ benzamide.
  • a carboxylic acid of formula (II) may react with an amine of formula (III) by methods known to those skilled in the art to give the compounds of the general formula (I).
  • the reaction takes place in that for example, a carboxylic acid of formula (II) is activated with reagents such as dicyclohexylcarbodiimide (DCC), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide (EDCI), N-hydroxybenzotriazole (HOBT), N-[(dimethylamino)-(3H-[1,2,3]triazolo[4,5-b]pyridin-3-yloxy)methyliden]-N-methylmethanaminium hexafluorophosphate (HATU) or propylphosphonic anhydride (T3P).
  • DCC dicyclohexylcarbodiimide
  • EDCI 1-(3-dimethylaminopropyl)-3-ethylcarbod
  • the reaction with HATU takes place in an inert solvent, such as N,N-dimethylformamide, dichloromethane or dimethyl sulfoxide in the presence of the appropriate amine formula (III) and a tertiary amine (such as triethylamine or diisopropylethylamine) at temperatures between -30°C and +60°C.
  • an inert solvent such as N,N-dimethylformamide, dichloromethane or dimethyl sulfoxide
  • a tertiary amine such as triethylamine or diisopropylethylamine
  • a carboxylic acid of the formula (II) into the corresponding carboxylic acid chloride with an inorganic acid chloride (such as phosphorus pentachloride, phosphorus trichloride or thionyl chloride) and then into the target compounds of the general formula (I), in pyridine or an inert solvent (such as N,N-dimethylformamide), in the presence of the appropriate amine formula (III) and a tertiary amine (for example triethylamine) at temperatures between -30°C and +60°C.
  • an inorganic acid chloride such as phosphorus pentachloride, phosphorus trichloride or thionyl chloride
  • an inert solvent such as N,N-dimethylformamide
  • a carboxylic acid of formula (II) may react with an amine of formula (IIIa) by methods known to those skilled in the art to give the compounds of the general formula (Ia).
  • the compounds of the general formula (I) can be obtained from boronic acid pinacol esters of the general formula (IV) by reaction with bromo-thiazoles of the formula (V) by methods known to those skilled in the art in a suitable solvent (for example N,N-dimethylformamide, tetrahydrofuran, 1,4-dioxane, dimethoxyethane and optionally water) and addition of a base (such as triethylamine, potassium carbonate, caesium carbonate) and a catalyst-ligand mixture, for example of palladium(II) acetate/ triphenylphosphine, tetrakis-(triphenylphosphine)palladium(0), bis(diphenylphosphino)ferrocenedichloro-palladium (II), at temperatures between 10°C and 120°C.
  • a suitable solvent for example N,N-dimethylformamide, tetrahydrofuran, 1,4-diox
  • the carboxylic acids of the general formula (II) can for example be obtained from esters of the formula (VI) by ester saponification in a suitable solvent or solvent mixture (for example methanol, ethanol or tetrahydrofuran) with addition of an aqueous solution of an alkali metal hydroxide, for example sodium hydroxide or lithium hydroxide, at temperatures between 10°C and 60°C (Scheme 2).
  • a suitable solvent or solvent mixture for example methanol, ethanol or tetrahydrofuran
  • an alkali metal hydroxide for example sodium hydroxide or lithium hydroxide
  • carboxylic acids of the formula (II) can be obtained from nitriles of the formula (XXXIV) by nitrile hydrolysis in a suitable solvent or solvent mixture (for example dimethyl sulfoxide or ethanol) with addition of an aqueous solution of an alkali metal hydroxide, for example sodium hydroxide, at temperatures between 80°C and 130°C (Scheme 5).
  • a suitable solvent or solvent mixture for example dimethyl sulfoxide or ethanol
  • an alkali metal hydroxide for example sodium hydroxide
  • the compounds of the general formula (VI) can be obtained from boronic acid pinacol esters of the general formula (IX) by reaction with bromo-thiazoles of the general formula (V) (Scheme 2), analogously to the synthesis of the compounds of formula (I) from the compounds formula (IV).
  • compounds of the formula (VII) can be obtained from boronic pinacol esters formula (VIII) and bromo-thiazoles formula (V) (Scheme 2).
  • compounds of the general formula (VI) can be obtained from phenols of the general formula (VII) by reaction with electrophiles R 2 -LG (LG: leaving group) of the general formula (XXIV) (Scheme 2), by methods known to those skilled in the art in a suitable solvent (for example N,N-dimethylformamide, acetonitrile, acetone, dimethyl sulfoxide) in the presence of a base (for example potassium carbonate and caesium carbonate) at temperatures between 10°C and 120°C.
  • a suitable solvent for example N,N-dimethylformamide, acetonitrile, acetone, dimethyl sulfoxide
  • a base for example potassium carbonate and caesium carbonate
  • a suitable leaving group may include, for example chloro, bromo, iodo, methanesulfonyloxy, p-toluenesulfonyloxy, trifluoromethanesulfonyloxy or nonafluorobutanesulfonyloxy.
  • phenols of the general formula (VII) may react with alcohols R 2 -LG (LG: OH) to give compounds of the general formula (VI) (Scheme 2), by methods known to those skilled in the art in a suitable solvent (for example dichloromethane or tetrahydrofuran) in the presence of triphenylphosphine and diisiopropyl azodicarboxylate, at temperatures between -20°C and 40°C.
  • a suitable solvent for example dichloromethane or tetrahydrofuran
  • compounds of the general formula (VI) can be obtained from phenols of the general formula (VII) by reaction with oxiranes of the general formula (XXV) (Scheme 2) as electrophiles (wherein R", R''' can independently be H or C 1 -C 4 -alkyl), by methods known to those skilled in the art in a suitable solvent (for example N,N-dimethylformamide, acetonitrile or dimethyl sulfoxide) in the presence of a base (for example potassium carbonate or caesium carbonate) at temperatures between 10°C and 120°C.
  • a suitable solvent for example N,N-dimethylformamide, acetonitrile or dimethyl sulfoxide
  • a base for example potassium carbonate or caesium carbonate
  • compounds of the formula (X) can be obtained from 3-bromo-5-hydroxybenzoic acid ester of the formula (XXVI) and compounds of the formula (XXIV) or formula (XXV), respectively (Scheme 2).
  • compounds of the formula (VI) can also be obtained from aryl bromides of the general formula (XXVIII) by reaction with a heteroaromatic alcohol of the formula (XXIV) (LG: OH, R 2 : 5-10-membered heteroaromatic system), by methods known to those skilled in the art in a suitable solvent (for example N-methyl-2-pyrrolidinone) in the presence of a base (for example potassium carbonate or caesium carbonate) and copper(I) chloride, by heating the reaction mixture in a microwave, at temperatures between 100°C and 220°C (Scheme 2). After workup and purification it may occur that by following the described procedure a carboxylic acid of the general formula (II) instead of the before mentioned ester of formula (VI) is obtained.
  • a suitable solvent for example N-methyl-2-pyrrolidinone
  • a base for example potassium carbonate or caesium carbonate
  • copper(I) chloride by heating the reaction mixture in a microwave, at temperatures between 100°
  • the compounds of the general formula (XXXIV) can be obtained from aryl fluorides of the formula (XXXII) by reaction with alcohols R 2 -OH of the general formula (XXXIII) (Scheme 5), by methods known to those skilled in the art in a suitable solvent (for example N,N-dimethylformamide) in the presence of a base (for example sodium hydride) at temperatures between 10°C and 80°C.
  • a suitable solvent for example N,N-dimethylformamide
  • a base for example sodium hydride
  • the compounds of the general formula (IV) can be obtained from aryl bromides of the general formula (XI) by reaction with bis(pinacolato)diborane (Scheme 3) in a suitable solvent (for example 1,4-dioxane) in the presence of potassium acetate and a catalyst (for example 1,1'-bis(diphenylphosphino)ferrocene-palladium(II)-dichloride dichloromethane complex or [1,1 '-bis(diphenylphosphino)ferrocene]di-chloropalladium(II)) at temperatures between 60°C and 100°C.
  • the compounds of the general formula (IVa) can be obtained from aryl bromides of the general formula (XIa).
  • compounds of the formula (IX) can be obtained from aryl bromides of general formula (X) and likewise compounds of the general formula (VIII) can be obtained from 3-bromo-5-hydroxybenzoic acid esters of formula (XXVI) (Scheme 2).
  • compounds of the general formula (XXXI) can be obtained from aryl bromides of the general formula (XXX) (Scheme 5).
  • the compounds of the general formula (XI) can be obtained from carboxylic acids of the general formula (XII) by reaction with amines of the general formula (III) (Scheme 3), analogously to the synthesis of the compounds of formula (I) from carboxylic acids formula (II) and amines formula (III).
  • the compounds of the general formula (XIa) can be obtained from carboxylic acids of the general formula (XII) by reaction with amines of the general formula (IIIa).
  • Compounds of the general formula (XXVIII) can be obtained from aryl bromides of the general formula (XXVII) by reaction with thiazoles of the formula (XXIX) (Met: e.g. tributylstannanyl) by methods known to those skilled in the art in a suitable solvent (for example N,N-dimethylformamide) and addition of a base (for example potassium carbonate or caesium carbonate) and a catalyst-ligand mixture (for example of palladium(II) acetate/ triphenylphosphine, tetrakis(triphenylphosphine)palladium(0)) at temperatures between 40°C and 120°C (Scheme 2).
  • a suitable solvent for example N,N-dimethylformamide
  • a base for example potassium carbonate or caesium carbonate
  • a catalyst-ligand mixture for example of palladium(II) acetate/ triphenylphosphine, tetraki
  • Amines of the general formula (IIIa) can be obtained from sulfinamides of the general formula (XIII) or (XIV) by methods known to those skilled in the art in a suitable solvent (for example methanol, 2-propanol, diethyl ether) and addition of an acid (for example hydrochloric acid) at appropriate concentrations (e.g. 4M in dioxane, 3M in 2-propanol, 2M in diethyl ether, 12M in water) at temperatures between 0°C and 40°C (Scheme 4).
  • the amines of the general formula (IIIa) may be obtained as the mono, bis or tris salt (for example the hydrochloric / dihydrochloric salts). Alternatively, the amine salt can be converted into the free base by methods known to those skilled in the art.
  • Amines of the general formula (III) and (IIIa) can be used as the free base or salt of undefined stoichiometry according to, but not limited to, the synthetic disclosure herein to obtain compounds of the general formula (I)/ (Ia) and general formula (XI)/ (XIa).
  • Sulfinamides of the general formula (XIII) can be obtained from ketones of the general formula (XVII) which are converted in situ to sulfinimides of the general formula (XV) by methods known to those skilled in the art in a suitable solvent (for example diethyl ether, tetrahydrofuran) and addition of titanium(IV) ethoxide and (S)-2-tert-butylsulfinamide, at temperatures between 10°C and 80°C.
  • a suitable solvent for example diethyl ether, tetrahydrofuran
  • titanium(IV) ethoxide and (S)-2-tert-butylsulfinamide at temperatures between 10°C and 80°C.
  • the sulfinimides (XV) can be directly converted to sulfinamides of the formula (XIII) by methods known to those skilled in the art in a suitable solvent (for example tetrahydrofuran) and the addition of L-selectride, at temperatures between -80°C and -70°C (Scheme 4).
  • a suitable solvent for example tetrahydrofuran
  • L-selectride at temperatures between -80°C and -70°C
  • Sulfinamides of the general formula (XIV) can be obtained from aldehydes of the general formula (XVIII) which are converted to sulfinimides of the general formula (XVI) by methods known to those skilled in the art in a suitable solvent (for example dichloroethane) and addition of Copper(II) sulfate and (R)-2-tert-butylsulfinamide, at temperatures between 10°C and 80°C.
  • a suitable solvent for example dichloroethane
  • Copper(II) sulfate and (R)-2-tert-butylsulfinamide at temperatures between 10°C and 80°C.
  • the sulfinimides (XVI) can be converted to sulfinamides of the formula (XIV) by methods known to those skilled in the art in a suitable solvent (for example tetrahydrofuran, diethyl ether) and the addition of a Grignard reagent R 3 MgX (X: Cl, Br), at temperatures between -70°C and -20°C (Scheme 4).
  • a suitable solvent for example tetrahydrofuran, diethyl ether
  • R 3 MgX X: Cl, Br
  • Amines having the opposite stereochemistry to the stereochemistry described for amines of the general formula (IIIa) can be synthesized in analogous fashion as described for amines (IIIa) starting from ketone (XVII) and using (R)-2-tert-butylsulfinamide instead of (S)-2-tert-butylsulfinamide.
  • ketone (XVII) ketone
  • R -2-tert-butylsulfinamide instead of (S)-2-tert-butylsulfinamide.
  • aldehyde (XVIII) starting from aldehyde (XVIII) and using using (S)-2-tert-butylsulfinamide instead of (R)-2-tert-butylsulfinamide.
  • Ketones of the general formula (XVII) can be obtained from Weinreb amides of the general formula (XIX) by methods known to those skilled in the art in a suitable solvent (for example tetrahydrofuran, diethyl ether, tert-butyl methyl ether or toluene) and the addition of a Grignard reagent R 3 MgX (X: Cl, Br, I), at temperatures between -20°C and 0°C (Scheme 4).
  • a suitable solvent for example tetrahydrofuran, diethyl ether, tert-butyl methyl ether or toluene
  • R 3 MgX X: Cl, Br, I
  • ketones of the general formula (XVII) can be obtained from nitriles of the general formula (XXII) and a Grignard reagent R 3 MgX (X: Cl, Br, I).
  • ketones of the general formula (XVII) can be obtained from halides of the general formula (XXIII) (Hal: Cl, Br) by methods known to those skilled in the art in a suitable solvent (for example N,N-dimethylformamide), tributyl(1-ethoxy-vinyl)stannane and a catalyst (for example dichlorobis(triphenylphosphine)-palladium(II)), at temperatures between 40°C and 100°C and subsequent cleavage of the enol ether intermediate under acidic conditions (for example aqueous hydrochloric acid), in a suitable solvent (for example tetrahydrofuran) at temperatures between 10°C and 40°C (Scheme 4).
  • a suitable solvent for example N,N-dimethylformamide
  • tributyl(1-ethoxy-vinyl)stannane and a catalyst for example dichlorobis(triphenylphosphine)-palladium(II)
  • Weinreb amides of the general formula (XIX) can be obtained from carboxylic acids of the general formula (XX) and N-methoxymethaneamine in analogous fashion as described for amides of formula (I) from carboxylic acids of formula (II).
  • Aldehydes of the general formula (XVIII) can be obtained from amides of the formula (XIX) by reduction methods known to those skilled in the art in a suitable solvent (for example tetrahydrofuran) and a reducing agent (for example lithium aluminium hydride) at temperatures between -80°C and -70°C (Scheme 4).
  • a suitable solvent for example tetrahydrofuran
  • a reducing agent for example lithium aluminium hydride
  • Bromo-thiazoles of the general formula (V) can be generated from amino-thiazoles of the formula (XXXV) by methods known to those skilled in the art in a suitable reaction medium (for example aqueous hydrobromic acid/ sodium nitirite, copper(II) bromide/ tert-butyl nitrite) in acetonitrile or N,N-dimethylformamide at temperatures between 0°C and 40°C (Scheme 4).
  • a suitable reaction medium for example aqueous hydrobromic acid/ sodium nitirite, copper(II) bromide/ tert-butyl nitrite
  • compounds of the general formula la, IIIa, IVa and XIa can be obtained directly from their racemic respectively diastereoisomeric mixtures of the general formula I, III, IV and XI through separation of said mixtures using methods known to someone skilled in the art (e.g. preparative chiral HPLC).
  • Reaction times are either specified explicitly in the protocols of the experimental section, or reactions were run until completion. Chemical reactions were monitored and their completion was judged using methods well known to the person skilled in the art, such as thin layer chromatography, e.g. on plates coated with silica gel, or by LCMS methods.
  • the crude material was purified by dry flash silica chromatography (eluting with 0 - 25 % EtOAc in heptanes). The material was further purified by slurrying in heptane to give the title compound 16.57 g (80 % yield) as an off-white solid.
  • reaction mixture was concentrated and the residue dissolved in THF (10 mL) and retreated with (2R)-tetrahydrofuran-2-ylmethanol (150 mg, 1.4 mmol), triphenylphosphine (475 mg, 1.8 mmol), DIAD (0.7 mL, 3.6 mmol) and the resulting solution stirred at RT for 72 hours.
  • the reaction mixture was concentrated under reduced pressure and the residue partitioned between water (20 mL) and EtOAc (20 mL). The aqueous layer was re-extracted with EtOAc (2 x 20 mL) and the combined organics dried (over MgSO 4 ) and concentrated under reduced pressure.
  • the reaction mixture was acidified to pH 3 with 1M HCl and extracted into EtOAc (3x 30 mL) and the combined organics washed with 1M HCl (4 x 20 mL).
  • the aqueous phase was concentrated (to -20 mL) and extracted with DCM (4 x 20 mL).
  • the combined DCM and EtOAc organics were dried (over MgSO 4 ) and concentrated to give 600 mg (86 % yield) of the title compound.
  • the resulting material was purified by chromatography using silica gel (gradient: hexane/EE) to give 571 mg (54 % yield) of the title compound as a yellow oil.
  • the impure fractions from chromatography were re-purified using the same conditions to give an additional 981 mg (25 % yield) of title compound.
  • the reaction mixture was washed with 1 M HCl (2 x 5 mL) before being dried over MgSO 4 , filtered and concentrated under reduced pressure.
  • the crude material was purified by Biotage IsoleraTM chromatography (silica gel, eluting with heptane-EtOAc, 10:1 to 1:1) to afford 606.1 mg (47% yield) of the title compound as white powder.

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